<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests" />
    <meta http-equiv="cache-control" content="no-cache" />
    <meta http-equiv="Pragma" content="no-cache" />
    <title>Trace Example</title>
    <style>
      * {
        box-sizing: border-box;
      }

      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
        overflow: hidden;
      }
    </style>
  </head>
  <body>
    <script type="text/javascript">
      'use strict';
      sessionStorage.clear();
      let req = new XMLHttpRequest();
      req.open('GET', document.location, false);
      req.send(null);
      window.version = req.getResponseHeader('data-version') || '';
    </script>
  </body>
</html>
